Mercurial > hg > truffle
view graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/calc/NormalizeCompareNode.java @ 9251:435bb9425124
added enum to Lowerable interface (before/after guard lowering)
author | Lukas Stadler <lukas.stadler@jku.at> |
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date | Tue, 23 Apr 2013 15:19:53 +0200 |
parents | 4a6646d8eb87 |
children | 19c5a07c7843 |
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/* * Copyright (c) 2009, 2012, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. */ package com.oracle.graal.nodes.calc; import com.oracle.graal.api.meta.*; import com.oracle.graal.nodes.*; import com.oracle.graal.nodes.spi.*; /** * Returns -1, 0, or 1 if either x < y, x == y, or x > y. If the comparison is undecided (one of the * inputs is NaN), the result is 1 if isUnorderedLess is false and -1 if isUnorderedLess is true. */ public final class NormalizeCompareNode extends BinaryNode implements Lowerable { public final boolean isUnorderedLess; /** * Creates a new compare operation. * * @param x the first input * @param y the second input * @param isUnorderedLess true when an unordered floating point comparison is interpreted as * less, false when greater. */ public NormalizeCompareNode(ValueNode x, ValueNode y, boolean isUnorderedLess) { super(Kind.Int, x, y); this.isUnorderedLess = isUnorderedLess; } @Override public void lower(LoweringTool tool, LoweringType loweringType) { StructuredGraph graph = (StructuredGraph) graph(); LogicNode equalComp; LogicNode lessComp; if (x().kind() == Kind.Double || x().kind() == Kind.Float) { equalComp = graph.unique(new FloatEqualsNode(x(), y())); lessComp = graph.unique(new FloatLessThanNode(x(), y(), isUnorderedLess)); } else { equalComp = graph.unique(new IntegerEqualsNode(x(), y())); lessComp = graph.unique(new IntegerLessThanNode(x(), y())); } ConditionalNode equalValue = graph.unique(new ConditionalNode(equalComp, ConstantNode.forInt(0, graph), ConstantNode.forInt(1, graph))); ConditionalNode value = graph.unique(new ConditionalNode(lessComp, ConstantNode.forInt(-1, graph), equalValue)); graph.replaceFloating(this, value); } }